Unclassified (chemistry): JEE Advanced 2022 Chemistry question

Match the compounds in LIST-I with the observations in LIST-II, and choose the correct option. LIST-I (I) Aniline (II) $o$-Cresol (III) Cysteine (IV) Caprolactam LIST-II (P) Sodium fusion extract of the compound on boiling with $\mathrm{FeSO}_{4}$, followed by acidification with conc. $\mathrm{H}_{2} \mathrm{SO}_{4}$, gives Prussian blue color. (Q) Sodium fusion extract of the compound on treatment with sodium nitroprusside gives blood red color. (R) Addition of the compound to a saturated solution of $\mathrm{NaHCO}_{3}$ results in effervescence. (S) The compound reacts with bromine water to give a white precipitate. (T) Treating the compound with neutral $\mathrm{FeCl}_{3}$ solution produces violet color.